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PROSTOMIAL

 - 2 dictionary results

pro⋅sto⋅mi⋅um

  [proh-stoh-mee-uhm]
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–noun, plural -mi⋅a  [-mee-uh] .
the unsegmented, preoral portion of the head of certain lower invertebrates.
Origin:
1865–70; < NL < Gk prostómion mouth. See pro- 2 , stoma, -ium

Related forms:
pro⋅sto⋅mi⋅al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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pro·sto·mi·um   (prō-stō'mē-əm)   
n.   pl. pro·sto·mi·a (-mē-ə)
The portion of the head in earthworms and other annelids that is situated anterior to the mouth.

[New Latin, from Greek prostomion, mouth, lips : pro-, in front of; see pro-2 + stoma, mouth.]
pro·sto'mi·al (-əl) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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